The Far-Infrared Polarization Spectrum: First Results and Analysis
The Far-Infrared Polarization Spectrum: First Results and Analysis
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远红外偏振光谱：初步结果和分析
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Vaillancourt
中科院分区：
文献类型：
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作者：
R. Hildebrand;J. L. Dotson;C. Dowell;D. Schleuning;J. Vaillancourt
本文给出了银河云在60 μm、100 μm和350 μm波段热辐射偏振的数据。在稠密云核[P（350）/P（100 μm）<$2]和云包层[P（350）/P（100 μm）<$0.6]中有上升偏振谱的例子。我们还提供的数据表明，在云核中的偏振和光学厚度之间的关系，P（τ）是不同的云信封。我们回顾了远红外偏振光谱的原理，并讨论了P（λ）和P（τ）数据的应用。我们的结论是，我们所观察到的云信封必须包含两个人口的颗粒，不同的偏振效率和发射光谱。我们提出了一个模型，云信封中的对比人口居住在不同的平均温度的温暖的域包含对齐的晶粒的域。
We present data on the polarization of the thermal emission from Galactic Clouds at 60 μm, 100 μm, and 350 μm. There are examples of rising polarization spectra in dense cloud cores [P(350 μm/P(100 μm)≈2], and falling spectra in cloud envelopes [P(350)/P(100 μm)≈0.6]. We also present data showing that the relationship, P(τ), between polarization and optical depth in cloud cores is different from that in cloud envelopes. We review the principles governing the far-infrared polarization spectrum and discuss applications to the data on P(λ) and P(τ). We conclude that the cloud envelopes we have observed must contain two populations of grains that differ in their polarization efficiencies and in their emission spectra. We propose a model for cloud envelopes in which the contrasting populations reside in domains of different mean temperatures where the warmer domains contain the aligned grains.